WO2016109921A1

WO2016109921A1 - Data transmission method, station, access point and access controller

Info

Publication number: WO2016109921A1
Application number: PCT/CN2015/070114
Authority: WO
Inventors: 王宁娟; 薛鑫; 罗俊
Original assignee: 华为技术有限公司
Priority date: 2015-01-05
Filing date: 2015-01-05
Publication date: 2016-07-14

Abstract

Disclosed are a data transmission method, a station, an access point and an access controller. The data transmission method comprises: transmitting a joint transmission indication frame to at least two access points, wherein the joint transmission indication frame is used for indicating the at least two access points to transmit the same data by means of the same time frequency resource; and receiving the data transmitted respectively by the at least two access points by means of the same time frequency resource using the same encoding method according to the joint transmission indication frame. In the embodiments of the present invention, a station initiates access point coordination, and multiple coordinated access points are indicated to simultaneously transmit the same data to the station using indication information. In this way, in a wireless local area network system, a coordinated transmission technique for multiple access points can be realized, i.e. the multiple access points use the same time frequency resource to transmit the same data to a station. In the embodiments of the present invention, by means of receiving multiple pieces of same data, the intensity of a received signal can be improved, so as to provide the reliability of data transmission.

Description

Data transmission method, site, access point and access controller

Technical field

The present invention relates to the field of wireless communication technologies, and in particular, to a method, a station, an access point, and an access controller for data transmission.

Background technique

Wireless Local Area Networks (WLAN) based on 802.11 standard is widely used as a low-cost, high-bandwidth wireless access technology. With the rapid development of the mobile Internet, users are increasingly demanding mobile high-speed data access, such as smart phones, tablets, smart phones, digital cameras, media players and other smart with wireless fidelity (WiFi) capabilities. The popularity of terminals is getting higher and higher. These smart terminals have brought great challenges to the development of WLAN technology. The WLAN network uses a free unlicensed band. Any organization or individual can use the WLAN band to access the network in a competitive manner, causing congestion in the WLAN band.

In an LTE (Long Term Evolution) system, a plurality of evolved base station or eNodeB (evolved Node B) cooperation is an interference processing technology, which can improve the transmission reliability of the system. Coordinated Multiple Points Transmission (CoMP) technology realizes cooperation of multiple neighboring cells by sharing information between different cells. Joint transmission (JT) is a method of CoMP cooperation technology. The joint transmission requires that multiple eNodeBs simultaneously send the same data to the user equipment after the transmission point is determined.

However, the authorization used by the LTE system is to determine the frequency band, and the base station can schedule the determined time-frequency resources. The WLAN operates in the free unlicensed band, and the channel access mode of the free unlicensed band is based on the carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) competition mechanism. The mechanism brings uncertainty about the use of the channel. This kind of uncertainty makes it difficult for each access point (AP) to transmit data to the station (STA, Station) at the same time, and thus multiple AP cooperation cannot be realized.

Summary of the invention

Embodiments of the present invention provide a data transmission method, a station, and an access point, where an access point can simultaneously transmit data to a site to implement cooperation of multiple access points.

In a first aspect, a method for data transmission is provided, and the method uses a wireless local area network system Include at least two access points and stations, wherein the station belongs to a basic service set of the at least two access points, the method comprising: sending a joint sending indication frame to the at least two access points, the joint sending indication The frame is configured to indicate that the at least two access points send the same data by using the same time-frequency resource, and receive the data that is sent by the at least two access points by using the same coding mode according to the joint transmission indication frame. .

In conjunction with the first aspect, in a first possible implementation of the first aspect, the joint transmission indication frame is a control frame.

With reference to the first aspect or the first possible implementation manner of the first aspect, in the second possible implementation manner of the first aspect, the joint sending indication frame includes a channel number field, a bandwidth field, and a modulation and coding policy MCS field. And a data length field, where the channel number field indicates a channel occupied by the at least two access points to send data, the bandwidth field indicating a bandwidth of a time-frequency resource used by the at least two access points to send data, the MCS field And indicating an encoding manner of the at least two access points to send data, where the data length field indicates a data length sent by the at least two access points.

In conjunction with the first aspect or any one of the first to the second possible implementations of the first aspect, in a third possible implementation of the first aspect, the receiving the at least two And the receiving, by the access point, the data sent by the same time-frequency resource in the same coding manner according to the joint transmission indication frame, respectively, comprising: receiving, by the at least two access points, delaying the short frame spacing SIFS when receiving the joint transmission indication frame respectively The data is transmitted through the same frequency band using the same coding method.

In conjunction with the first aspect or any one of the first to third possible implementations of the first aspect, in a fourth possible implementation of the first aspect, the at least two Before sending the joint sending indication frame, the method further includes: receiving a request sending frame sent by the first access point of the at least two access points, where the request sending frame is used to request to send the data to the station; Sending the joint sending indication frame to the at least two access points includes: sending the frame according to the received request, and sending the joint sending indication frame to the at least two access points.

In conjunction with the fourth possible implementation of the first aspect, in a fifth possible implementation manner of the first aspect, the WLAN system further includes an access controller, where the at least two access points are received Before the sending of the request by the first access point, the method further includes: acquiring identification information of the at least two access points; and sending identifier information of the at least two access points to the access controller, to facilitate the The access controller creates a site list according to the obtained information of the site and the identification information of the at least two access points, and sends the data to the at least two access points searched according to the site list.

In a second aspect, a method for data transmission is provided, where the wireless local area network system includes at least two access points and stations, wherein the station belongs to a basic service set of the at least two access points, the method The first access point of the at least two access points receives a joint transmission indication frame sent by the station, where the joint transmission indication frame is used to indicate that the at least two access points send the same data by using the same time-frequency resource. And transmitting the data to the station according to the joint sending indication frame, wherein the at least two access points send the same data to the station by using the same coding mode in the same time-frequency resource.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the joint sending indication frame is a control frame.

With reference to the second aspect, or the first possible implementation manner of the second aspect, in the second possible implementation manner of the second aspect, the joint sending indication frame includes a channel number field, a bandwidth field, and a modulation and coding policy MCS field. And a data length field, where the channel number field indicates a channel occupied by the at least two access points to send data, the bandwidth field indicating a bandwidth of a time-frequency resource used by the at least two access points to send data, the MCS field And indicating an encoding manner of the at least two access points to send data, where the data length field indicates a data length sent by the at least two access points.

With reference to the second aspect, or any one of the first to the second possible implementation manners of the second aspect, in a third possible implementation manner of the second aspect, the And sending the data to the station, according to the joint sending indication frame, sending the data to the station after delaying the short frame interval SIFS when receiving the joint transmission indication frame.

With reference to the second aspect, or any one of the first to the third possible implementation manners of the second aspect, in the fourth possible implementation manner of the second aspect, the at least two Before the first access point in the ingress receives the joint sending indication frame sent by the station, the method further includes: sending a request sending frame to the station, where the request sending frame is used to request the station to send the data.

In conjunction with the fourth possible implementation of the second aspect, in a fifth possible implementation manner of the second aspect, the wireless local area network system further includes an access controller, where before the sending the request sending frame to the station The method further includes: obtaining information about the site and identification information of the at least two access points; transmitting information of the site and identification information of the two access points to the access controller, to facilitate the access controller And creating a site list according to the acquired information of the site and the identification information of the at least two access points and transmitting the data to the at least two access points searched according to the site list; receiving the data from the access controller.

In a third aspect, a method for data transmission is provided, and the method uses a wireless local area network system An access controller, a plurality of access points, and at least one site, the method comprising: determining a correspondence between the plurality of access points and the at least one site, wherein each of the at least one site corresponds to the Determining at least two access points of the plurality of access points; determining at least two accesses corresponding to the destination station of the downlink data according to the destination station of the downlink data and the correspondence between the multiple access points and the at least one site Sending the downlink data to at least two access points corresponding to the destination station, so that at least two access points corresponding to the destination station send the downlink data to the destination station by using the same coding mode in the same time-frequency resource. .

With reference to the third aspect, in a first possible implementation manner of the third aspect, the determining the correspondence between the multiple access points and the at least one site includes: receiving information of the at least one site from the at least one site And the identification information of the multiple access points; determining the correspondence between the multiple access points and the at least one site according to the information of the at least one site and the identification information of the multiple access points.

A fourth aspect provides a site, where the WLAN system of the site further includes at least two access points, wherein the site belongs to a basic service set of the at least two access points, and the site includes: a sending unit And sending, to the at least two access points, a joint sending indication frame, where the joint sending indication frame is used to indicate that the at least two access points send the same data by using the same time-frequency resource, and the receiving unit is configured to receive the at least two The two access points respectively transmit the data through the same time-frequency resource in the same coding manner according to the joint transmission indication frame.

With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the joint sending indication frame sent by the sending unit is a control frame.

With reference to the fourth aspect, or the first possible implementation manner of the fourth aspect, in the second possible implementation manner of the fourth aspect, the joint sending indication frame sent by the sending unit includes a channel number field, a bandwidth field, and a modulation And a coding policy MCS field and a data length field, wherein the channel number field indicates a channel occupied by the at least two access points to transmit data, the bandwidth field indicating a time-frequency resource used by the at least two access points to transmit data Bandwidth, the MCS field indicates an encoding manner of the data transmitted by the at least two access points, and the data length field indicates a data length sent by the at least two access points.

With reference to the fourth aspect or any one of the possible implementation manners of the first to the second possible implementation manners of the fourth aspect, in the third possible implementation manner of the fourth aspect, the receiving unit is specifically used And receiving, by the at least two access points, the data sent by the same frequency band by using the same coding mode after delaying the short frame interval SIFS when receiving the joint transmission indication frame.

With reference to the fourth aspect, or any one of the first to the third possible implementation manners of the fourth aspect, in a fourth possible implementation manner of the fourth aspect, the receiving unit is further used Receiving a request sending frame sent by a first one of the at least two access points, the request sending frame is configured to send the data to the station, where the sending unit is specifically configured to receive the request according to the request Sending a frame, sending the joint transmission indication frame to the at least two access points.

In conjunction with the fourth possible implementation of the fourth aspect, in a fifth possible implementation manner of the fourth aspect, the wireless local area network system further includes an access controller, where the site further includes: an acquiring unit, configured to: Obtaining the identification information of the at least two access points, where the sending unit is further configured to send the identifier information of the at least two access points to the access controller, so that the access controller obtains the The information of the site and the identification information of the at least two access points create a site list and send the data to the at least two access points that are searched according to the site list.

A fifth aspect provides an access point, where the wireless local area network system includes at least two access points and a site, where the site belongs to a basic service set of the at least two access points, where The access point includes: a receiving unit, configured to receive a joint sending indication frame sent by the station, where the joint sending indication frame is used to indicate that the at least two access points send the same data by using the same time-frequency resource; And transmitting the data to the station according to the joint sending indication frame, wherein the at least two access points send the same data to the station by using the same time-frequency resource in the same coding manner.

With reference to the fifth aspect, in a first possible implementation manner of the fifth aspect, the joint sending indication frame received by the receiving unit is a control frame.

With reference to the fifth aspect, or the first possible implementation manner of the fifth aspect, in the second possible implementation manner of the fifth aspect, the joint sending indication frame received by the receiving unit includes a channel number field, a bandwidth field, and a modulation And a coding policy MCS field and a data length field, wherein the channel number field indicates a channel occupied by the at least two access points to transmit data, the bandwidth field indicating a time-frequency resource used by the at least two access points to transmit data Bandwidth, the MCS field indicates an encoding manner of the data transmitted by the at least two access points, and the data length field indicates a data length sent by the at least two access points.

With reference to the fifth aspect or any one of the possible implementation manners of the first to the second possible implementation manners of the fifth aspect, in the third possible implementation manner of the fifth aspect, the sending unit is specifically used And transmitting the data to the station after delaying the short frame interval SIFS when receiving the joint transmission indication frame according to the joint transmission indication frame.

With reference to the fifth aspect or any one of the first to the third possible implementation manners of the fifth aspect, in a fourth possible implementation manner of the fifth aspect, the sending unit is further used A request sending frame is sent to the site, and the request sending frame is used to request the station to send the data.

In conjunction with the fourth possible implementation of the fifth aspect, in a fifth possible implementation manner of the fifth aspect, the WLAN system further includes an access controller, where the access point further includes: an acquiring unit, Information for obtaining the site and identification information of the at least two access points; wherein the sending unit is further configured to send the information of the site and the identifier information of the two access points to the access controller, So that the access controller creates a site list according to the acquired information of the site and the identification information of the at least two access points, and sends the data to the at least two access points searched according to the site list; the receiving unit Also used to receive the data from the access controller.

In a sixth aspect, an access controller is provided, where the wireless local area network system of the access controller further includes multiple access points and at least one site, and the access controller includes: a first determining unit, configured to determine a correspondence between the plurality of access points and the at least one site, wherein each of the at least one site corresponds to at least two of the plurality of access points; and the second determining unit is configured to: Determining at least two access points corresponding to the destination station of the downlink data according to the destination station of the downlink data and the corresponding relationship between the multiple access points and the at least one station; and sending, by the sending unit, at least corresponding to the destination station The two access points send the downlink data, so that at least two access points corresponding to the destination station send the downlink data to the destination station by using the same time-frequency resource in the same coding manner.

With reference to the sixth aspect, in a first possible implementation manner of the sixth aspect, the first determining unit is configured to receive, by the at least one site, the information of the at least one site and the identifier information of the multiple access points. And determining, according to the information of the at least one site and the identification information of the multiple access points, the correspondence between the multiple access points and the at least one site.

In the embodiment of the present invention, the access point cooperation is initiated by the site, and the multiple access points that indicate the cooperation by using the indication information simultaneously send the same data to the site. In this way, in the wireless local area network system, multiple access point cooperative transmission technologies can be implemented, that is, multiple access points use the same time-frequency resource to transmit the same data to the station. The embodiment of the present invention can improve the strength of the received signal by receiving a plurality of identical data, thereby providing reliability of data transmission.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings to be used in the embodiments of the present invention will be briefly described below. It is obvious that the drawings described below are only some embodiments of the present invention, Those skilled in the art can also obtain other drawings based on these drawings without paying any creative work.

1 is a schematic diagram of a scenario in which the present invention is applicable.

2 is a schematic flow chart of a method for data transmission according to an embodiment of the present invention.

FIG. 3 is a schematic flowchart of a method for data transmission according to another embodiment of the present invention.

FIG. 4 is a schematic flowchart of a method for data transmission according to another embodiment of the present invention.

FIG. 5 is a schematic flowchart of a method for data transmission according to another embodiment of the present invention.

FIG. 6 is a schematic flowchart of a process of data transmission according to another embodiment of the present invention.

Figure 7 is a schematic block diagram of a station in accordance with one embodiment of the present invention.

Figure 8 is a schematic block diagram of an access point in accordance with one embodiment of the present invention.

9 is a schematic block diagram of an access controller in accordance with an embodiment of the present invention.

Figure 10 is a schematic block diagram of a station in accordance with another embodiment of the present invention.

11 is a schematic block diagram of an access point according to another embodiment of the present invention.

Figure 12 is a schematic block diagram of an access controller in accordance with another embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of the present invention.

The technical solution of the present invention can be applied to various wireless communication systems, for example, based on Wireless Fidelity (WIFI), Bluetooth, and Worldwide Interoperability for Microwave Access (WiMAX), wireless. A system such as a Wireless LAN Authentication and Privacy Infrastructure (WAPI) and other communication systems that interconnect terminals wirelessly.

An Access Point (AP), which can also be called a wireless access point or bridge or hotspot, can access a server or a communication network.

Site (STA, Station), which can be a wireless sensor, a wireless communication terminal or a mobile terminal, such as a mobile phone (or "cellular" phone) that supports WiFi communication function and has wireless communication work The capable computer, for example, may be a portable, pocket, handheld, computer built-in or in-vehicle wireless communication device that supports WiFi communication functions, which exchange voice and/or data with the wireless access network.

1 is a schematic diagram of a scenario in which the present invention is applicable. Figure 1 shows the wireless LAN WLAN system. The system includes a first access point 110, a second access point 120, and a plurality of station STAs.

Basic Service Set (BSS) is the basic building block of WLAN. The same communication can be maintained by the AP before the STA within the BSS coverage area. If a STA moves out of the BSS, the STA cannot directly communicate with other STAs in the BSS. In addition, the Overlapping Basic Service Set (OBSS) is an overlapping area of two different BSSs.

Both the AP and the STA involved in Figure 1 support the 802.11ac standard. The first access point 110 in FIG. 1 and the first site 101 and the second site 102 form a first basic service set, and the second access point 120 and the third site 103, the fourth site 104, and the fifth site 105 form a first access point. The second basic service set, wherein the fifth site 105 is within the OBSS area of the first basic service set and the second basic service set. The 802.101ac standard states that all nodes (including access points and sites) must contend for channels using the CSMA/CA mechanism before sending data. For example, the fifth station 105 is to transmit data, first competing for the channel. After competing to the channel, if the length of the data to be transmitted is greater than a certain threshold, in order to reduce the interference of the surrounding node to the fifth station 105, the fifth station 105 sends a Request to Send (RTS) or allows the transmission of the frame (Clear to Send) , CTS) sets the Network Allocation Vector (NAV) of the adjacent node, and the first access point 110 sets the NAV and then does not send data on the entire frequency band.

Since each node enters the channel using the CSMA/CA mechanism, this makes the node that needs to transmit data uncertain when it is possible to access the channel. In multiple AP cooperative transmission technologies, multiple APs are required to transmit the same data on the same time-frequency resource. Thus, in a WLAN system, AP cooperative transmission technology is difficult to implement.

2 is a schematic flow chart of a method for data transmission according to an embodiment of the present invention. The wireless local area network system to which the method is applied includes at least two access points and stations, wherein the stations belong to a basic service set of at least two access points. The method of Figure 2 can be performed by a site in a WLAN system. The method 200 can include:

210. Send a joint sending indication frame to the at least two access points, where the joint sending indication frame is used to indicate that at least two access points send the same data by using the same time-frequency resource.

220. Receive data that is sent by the at least two access points by using the same time-frequency resource according to the joint transmission indication frame.

It should be understood that, for convenience of description, only one site is described in the embodiment of the present invention. It should be understood that, in a WLAN system, stations in a basic service set belonging to at least two access points may perform data transmission by using the method of the embodiment of the present invention. The basic service set of the site belonging to at least two access points is within the overlapping basic service set of the at least two access points.

It should also be understood that at least two access points that cooperate with each other use the same frequency band. 1 , the first access point 110 and the second access point 120 may constitute two access points of the at least two access points, and the fifth station 105 may be a station in the embodiment of the present invention. For convenience of description, the second access point 120 may be referred to as a primary access point, and the first access point 110 may be referred to as a cooperative access point. The first access point 110 and the second access point 120 belong to access points that cooperate with each other within the same collaborative set. Optionally, the method for establishing the cooperation relationship between the first access point 110 and the second access point 120 is not limited in the embodiment of the present invention.

The station sends the joint transmission indication frame to at least two access points by way of broadcast. The joint transmission indication frame is used to indicate that at least two access points send the same data through the same time-frequency resource. It should be understood that each of the at least two access points transmits data through the same time-frequency resource, and the data transmitted by each access point is also the same. At least two access points transmit data through the same time-frequency resource, that is, transmit data in the same frequency band at the same time.

Optionally, as another embodiment, in 220, the station may receive the same coding after the short inter-Frmae Space (SIFS) is received by the at least two access points respectively when receiving the joint transmission indication frame. Way to send data through the same frequency band.

Specifically, in the existing WLAN system, if the access point needs to send downlink data to the station, it needs to send an RTS frame to the station after competing for the channel, and the RTS frame is used to request to send data to the station. After receiving the RTS frame, the station returns a CTS frame after delaying the SIFS, and the CTS frame is used to reply to the access point to allow data to be sent. The WLAN system sets the data to be transmitted to the station after the access point receives the CTS frame and delays the SIFS. It should be understood that SIFS is a unit of time and can represent the minimum interval between frames.

The setting of the WLAN system can be applied to the embodiment of the present invention. The station may send the joint transmission indication frame in a broadcast manner, and at least two access points may send the same data in the same frequency band after delaying the SIFS by using the same coding manner when receiving the joint transmission indication frame. Optionally, as another embodiment, the station may also broadcast the joint transmission indication frame after delaying the SIFS when receiving the RTS frame. Here, at least two access points may consider that the joint transmission indication frame is received at the same time. In this embodiment of the present invention, the station may send a joint sending indication frame instead of the original CTS frame, and indicate that the corresponding at least two access points send the same data by using the same time-frequency resource.

FIG. 3 is a schematic flowchart of a method for data transmission according to another embodiment of the present invention. For the convenience of description, the same steps in FIG. 3 as those in FIG. 2 are given the same reference numerals. Before step 210, the method 200 shown in FIG. 2 may further include:

230. Receive a request sending frame sent by a first one of the at least two access points, where the request sending frame is used to request sending data to the station.

Wherein, in 210, the station may send a frame according to the received request, and send a joint transmission indication frame to at least two access points.

Specifically, the access point contends to the channel, and sends a request sending frame to the station, where the request sending frame can carry the channel number and data length of the request to send data. The station sends a frame according to the received request, and can generate a joint transmission indication frame. The joint transmission indication frame may carry a channel number and a data length carried in the request transmission frame.

Optionally, as another embodiment, the joint sending indication frame may further carry a bandwidth and an encoding manner of sending data. The station may select an appropriate bandwidth according to the bandwidth capability of the at least two access points to generate a bandwidth indicated in the joint transmission indication frame. The station may also set the coding mode of the access point that contends to the channel to the coding mode indicated in the joint transmission indication frame.

The setting of the joint transmission indication frame will be described in detail below with reference to Tables 1 to 4.

Optionally, as another embodiment, the joint sending indication frame may be a control frame.

Optionally, as another embodiment, the joint sending indication frame may include a channel number field, a bandwidth field, a modulation and coding policy MCS field, and a data length field, where the channel number field indicates that at least two access points use data to be occupied. The channel, the bandwidth field indicates the bandwidth of the time-frequency resource used by the at least two access points to transmit data, the MCS field indicates the coding mode of the data transmitted by the at least two access points, and the data length field indicates the data sent by the at least two access points. length.

It should be understood that the type of frame may include control frames, data frames, and the like. The joint transmission indication frame in the embodiment of the present invention may be a control frame.

In order to be forward compatible, when the joint transmission indication frame is a control frame, the frame header can be completely consistent with the frame header format of the existing control frame. The joint transmission of the indication information indicated by the indication frame is placed in the frame body of the control frame. In this way, the station can obtain relevant information from the MAC frame header of the joint transmission indication frame. For example, NAV information to avoid interference and hidden terminal problems.

Specifically, Table 1 is a description of each subtype that introduces a null pointer after the joint transmission indication frame.

Table 1

As shown in Table 1, the 0000-0010 field in the control frame is a reserved field. After the joint transmission indication frame is introduced, 0110 in the control frame may be used to indicate the joint transmission indication frame. Optionally, as another embodiment, other reserved fields may also be selected to indicate the joint sending indication frame, and the embodiment of the present invention is not limited thereto.

Optionally, as another embodiment, the joint sending indication frame may include a channel number field, a bandwidth field, an MCS field, and a data length field. Table 2 may be a description of the value of the channel number field occupied by the joint indication indication frame.

Table 2

Among them, 36, 37, and 38 in Table 2. . . Indicates the corresponding primary channel number in the 802.11ac standard. For example, if the value of the channel number field is 1, the access point uses the channel with channel number 36 to transmit data.

Table 3 may be used to jointly send a description of the value of the bandwidth field occupied by the indication frame.

table 3

For example, if the value of the bandwidth field is 1, the access point uses 10MHz bandwidth to transmit data.

Table 4 is a description of the value of the MCS field occupied by the joint transmission indication frame.

Table 4

Among them, Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), 16-Quad Amplitude Modulation (16-QAM) 64-Quadrature Amplitude Modulation (64-QAM) and 64 symbols are desirable modulation schemes for the MCS field.

Optionally, as another embodiment, the data length field occupied by the joint sending indication frame may range from 0 to 65535.

Optionally, as another embodiment, the WLAN system in the embodiment of the present invention may further include an access controller. Before 230, the method 200 may further include:

240: Obtain identification information of at least two access points;

250. Send, to the access controller, identifier information of the at least two access points, so that the access controller creates a site list according to the acquired information of the site and the identification information of the at least two access points, and searches for the list according to the site list. At least two access points send data.

In addition, the access controller is introduced to uniformly manage and send the coordinated data to the access point for easy access. The point transmits data to the station through the same time-frequency resource according to the indication information of the station. Therefore, the embodiment of the present invention can reduce repeated transmission of data.

Specifically, the sites within the OBSS can scan the network, determine that they are within the OBSS area, and record the identification information of all scanned access points. The identification information of the access point can be used to indicate which access points the site corresponds to. Specifically, the identifier information of the access point may be a Media Access Control (MAC) address of the access point, or may be a Basic Service Set Identifier (BSSID), and the present invention is not limited thereto. this. The identification information of the access point can be identified as the access point corresponding to the site in the OBSS.

The station sends the identification information of the at least two access points to the access controller, which may be sent directly or indirectly. Specifically, the station may directly send the identifier information of the scanned access point to the access controller, or send the identifier information of the scanned access point to the primary access point, and then send and receive the connection information by the primary access point. Enter the controller.

It should be understood that when the access point or the access controller receives the identification information of at least two access points sent by the station, the information of the site may also be acquired. The information of the site may include information such as the identity of the site, location information, and the like. In this way, after obtaining the information of the site and the identification information of the access point, the access controller can establish a site list. The sites in the list are within the OBSS and each site corresponds to at least two access points. For example, in the scenario of FIG. 1, the site list may include information of the fifth site and corresponding identification information of the first access point and the second access point.

Optionally, as another embodiment, the station may report the identifier information of the access point of the OBSS area to the primary access point by adding a field. The information of the site and the identification information of the access point are obtained by the primary access point and reported to the access controller.

Specifically, the newly added field may carry OBSS capability information, which may be used to describe a field of an OBSS capability of an access point or site supporting a certain WLAN scheme. The OBSS capability information may include the number of access points and the MAC addresses of all access points corresponding to the sites in the OBSS.

Optionally, as another embodiment, the access controller may not need to establish a site list, and only needs to obtain a correspondence between the site and the corresponding at least two access points. According to the correspondence, the access controller can find at least two access points corresponding to different sites according to different sites, and send data to the at least two access points.

FIG. 4 is a schematic flowchart of a method for data transmission according to another embodiment of the present invention. The wireless local area network system to which the method is applied includes at least two access points and stations, wherein the stations belong to at least two Within the basic service set of the access point. The method of Figure 4 can be performed by any one of at least two access points in a WLAN system. The method 200 can include:

410. The first access point of the at least two access points receives a joint sending indication frame sent by the station, where the joint sending indication frame is used to indicate that at least two access points send the same data by using the same time-frequency resource.

420. Send data to the station according to the joint sending indication frame, where at least two access points send the same data to the station by using the same coding mode in the same time-frequency resource.

It should be understood that, for convenience of description, only one access point is described in the embodiment of the present invention. Each of the access points corresponding to the sites in the OBSS in the embodiment of the present invention may perform data transmission by using the method in the embodiment of the present invention.

It should be understood that each of the at least two access points transmits data through the same time-frequency resource, and the data transmitted by each access point is also the same. At least two access points transmit data through the same time-frequency resource, that is, transmit data in the same frequency band at the same time.

Optionally, as another embodiment, in 420, the access point may send data to the station after delaying the short frame interval SIFS when receiving the joint transmission indication frame according to the joint transmission indication frame.

Specifically, in the existing WLAN system, if the access point needs to send downlink data to the station, it needs to send an RTS frame to the station after competing for the channel, and the RTS frame is used to request to send data to the station. After receiving the RTS frame, the station returns a CTS frame after delaying the SIFS, and the CTS frame is used to reply to the access point to allow data to be sent. The WLAN system sets the data to be transmitted to the station after the access point receives the CTS frame and delays the SIFS. It should be understood that SIFS is a unit of time and can represent frames and The minimum interval between frames.

The setting of the WLAN system can be applied to the embodiment of the present invention. When receiving the joint transmission indication frame, the access point may use the same coding mode to transmit the same data through the same frequency band after delaying the SIFS. Here, at least two access points may consider that the joint transmission indication frame is received at the same time. In this embodiment of the present invention, the station may send a joint sending indication frame instead of the original CTS frame, and indicate that the corresponding at least two access points send the same data by using the same time-frequency resource.

Optionally, in another embodiment, in 420, if the access point is a cooperative access point, the cooperative access point may send data to the station in a frequency band that is jointly sent by the indication frame, and does not send data in the remaining frequency bands. It is also possible to transmit data to the station on the frequency band in which the indication frame is jointly transmitted, and to transmit data of other stations on the remaining frequency bands.

Optionally, as another embodiment, if the access point is the primary access point, before the step 410, the method 400 further includes:

430. Send a request sending frame to the station, and request the sending frame to request sending data to the station.

Specifically, the primary access point contends to the channel, and sends a request sending frame to the station, where the request sending frame can carry the channel number and data length of the request sending data. The station sends a frame according to the received request, and can send the indication frame jointly. The joint transmission indication frame may carry a channel number and a data length carried in the request transmission frame.

In order to be forward compatible, when the joint transmission indication frame is a control frame, the frame header can be completely consistent with the frame header format of the existing control frame. Jointly transmitting control information indicated by the indication frame to the control frame In the frame body. In this way, the station can obtain relevant information from the MAC frame header of the joint transmission indication frame. For example, NAV information to avoid interference and hidden terminal problems.

The description of the joint sending indication frame in the embodiment of the present invention may be applied to the descriptions of the above-mentioned combined tables 1 to 4. To avoid repetition, it will not be described in detail here.

Optionally, as another embodiment, the wireless network local area network system in the embodiment of the present invention may further include an access controller. Before 430, the method 400 may further include:

440. Obtain information about the site and identification information of the at least two access points.

450, sending information of the site and identification information of the two access points to the access controller, so that the access controller creates a site list according to the information of the acquired site and the identification information of the at least two access points and to the site according to the site At least two access points of the list lookup send data;

460. Receive data from an access controller.

In addition, the access controller is configured to uniformly manage and send the coordinated data to the access point, so that the access point sends the data to the site through the same time-frequency resource according to the indication information of the site. Therefore, the embodiment of the present invention can reduce the repeated transmission of data. .

Specifically, if the access point is the primary access point, the primary access point may receive the identifier information of the access point sent by the station. According to the identification information of the access point, information of the site can be collected. The information of the site may include information such as the identity of the site, location information, and the like. The primary access point sends the acquired information of the site and the identification information of the access point to the access controller. In this way, after obtaining the information of the site and the identification information of the access point, the access controller can establish a site list. The sites in the list are within the OBSS and each site corresponds to at least two access points. For example, in the scenario of FIG. 1, the site list may include information of the fifth site and corresponding identification information of the first access point and the second access point.

FIG. 5 is a schematic flowchart of a method for data transmission according to another embodiment of the present invention. The method shown in Figure 5 can be performed by an access controller. The wireless local area network system to which the method is applied includes an access controller, a plurality of access points, and at least one station, and the method 500 includes:

510. Determine a correspondence between multiple access points and at least one site, where each of the at least one site corresponds to at least two of the multiple access points;

520. Determine, according to the destination station of the downlink data, and the correspondence between the multiple access points and the at least one site, the at least two access points corresponding to the destination station of the downlink data.

530. Send downlink data to at least two access points corresponding to the destination station, so that at least two access points corresponding to the destination station send downlink data to the destination station by using the same time-frequency resource in the same coding manner.

In the embodiment of the present invention, the access controller uniformly manages the access point, and sends downlink data to each access point that needs to perform cooperative transmission of data. In this way, the access point sends the data sent by the access controller to the station through the same time-frequency resource, which can reduce the repeated transmission of data.

Optionally, as another embodiment, in 510, the access controller may receive information of the at least one site and the identification information of the multiple access points from the at least one site; according to the information of the at least one site and multiple accesses The identification information of the point determines the correspondence between the multiple access points and the at least one site.

Optionally, as an embodiment, the access controller may receive the identifier information of the access point corresponding to the at least one site sent by the at least one site. The access controller can also obtain information of the at least one site. The information of the site may include the identity of the site, the location information of the site, and the like.

Optionally, as another embodiment, the access controller may further receive information of the at least one site sent by the primary access point and the identifier information of the multiple access points corresponding to the at least one site respectively. Specifically, the station may send the identifier information of the scanned access point to the primary access point, and then send the primary access point to the access controller. When receiving the identification information of at least two access points sent by the station, the primary access point may also obtain information about the site.

FIG. 6 is a schematic flowchart of a process of data transmission according to an embodiment of the present invention. The WLAN system shown in FIG. 6 includes an access controller, a first access point, a second access point, and a station. For convenience of description, the embodiment of the present invention describes only the case of two access points. It should be understood that at least two access points may be included in the WLAN system, where one access point may be referred to as a primary access point, and the other at least one access point may be a cooperative access point. The execution process of a collaborative access point can be the same.

In FIG. 6, the second access point may be set as the primary access point, and the first access point is the coordinated access point. The station belongs to the overlapping basic service set OBSS of the BSS of the first access point and the BSS of the second access point.

The process can include:

601. The station sends the identifier information of the scanned access point to the second access point.

Specifically, in the embodiment of the present invention, the identifier information of the access point may be the identifier information of the first access point and the identifier information of the second access point.

It should be understood that only one site is described in the embodiment of the present invention. Multiple sites may be included in a WLAN system. The multiple sites can scan the network separately to determine which sites are located within the OBSS. The method of data transmission of the embodiment of the present invention can be adopted by each station located in the OBSS. Among them, a site is described as follows:

The site can scan the network first and record the identification information of the scanned access point. The identification information of the access point can be used to indicate which access points the site corresponds to. Specifically, the identifier information of the access point may be a Media Access Control (MAC) address of the access point, or may be a Basic Service Set Identifier (BSSID), and the present invention is not limited thereto. this. The identification information of the access point can be identified as the access point corresponding to the site in the OBSS.

602. The second access point collects information about the site.

Specifically, when receiving the identifier information of the access point sent by the station, the second access point may also obtain information about the site. The information of the site may include information such as the identity of the site, location information, and the like.

603. The second access point sends the information of the site and the identifier information of the access point to the access controller.

Specifically, the identifier information of the access point in the embodiment of the present invention may be the identifier information of the first access point and the identifier information of the second access point.

604. The access controller establishes a site list according to the information of the site and the identification information of the access point.

Specifically, the information of the site and the identifier information of the corresponding access point may be saved in the site list. For example, in the embodiment of the present invention, the site list may include information of the site and corresponding identification information of the first access point and the second access point.

605. The access controller sends downlink data to the first access point and the second access point.

Specifically, after receiving the data on the network side, the access controller searches for a list of sites. If the data is data of the site, query the access point corresponding to the site. In the embodiment of the present invention, the access controller finds that the access point corresponding to the site is the first access point and the second access point. The access controller sends the data of the site to the first access point and the second access point respectively.

The access controller and the access point can communicate with each other through a Control and Provisioning of Wireless Access Points Protocol (CAPWAP) protocol.

606. The second access point sends a request to send a frame to the station.

Specifically, the second access point contends to the channel, and sends a request sending frame to the station, where the request sending frame can carry the channel number and data length of the request to send data.

607. The station broadcast jointly sends an indication frame.

Specifically, when receiving the request to send a frame, the station broadcasts the joint transmission indication frame after the SIFS interval. The station sends a frame according to the received request, and can generate a joint transmission indication frame. The joint transmission indication frame may carry a channel number and a data length carried in the request transmission frame.

Optionally, as another embodiment, the joint sending indication frame may further carry a bandwidth and an encoding manner of sending data. The station may select an appropriate bandwidth according to the bandwidth capability of the first access point and the second access point to generate a bandwidth indicated in the joint transmission indication frame. The station may also set the coding mode of the second access point that contends to the channel to the coding mode indicated in the joint transmission indication frame.

608. The first access point and the second access point send data to the station at the same time-frequency resource.

It should be understood that the data is data that the access controller sends to the first access point and the second access point. When detecting the joint broadcast indication frame of the station broadcast, the first access point and the second access point send data to the station after delaying the SIFS interval.

Optionally, as another embodiment, the first access point may send data to the station on the frequency band indicated by the joint transmission indication frame, and does not send data on the remaining frequency bands; or may send on the frequency band jointly sent by the indication indication frame indication. Data is sent to the site, and data from other sites is sent on the remaining bands.

Figure 7 is a schematic block diagram of a station in accordance with one embodiment of the present invention. The station can implement the method or process shown in FIG. 2, FIG. 3 or FIG. 6 above. To avoid repetition, it will not be described in detail here. The WLAN system in which the site is located also includes at least two access points, wherein the site belongs to a basic service set of at least two access points. As shown in FIG. 7, the site 700 includes:

The sending unit 701 sends a joint sending indication frame to the at least two access points, where the joint sending indication frame is used to indicate that at least two access points send the same data by using the same time-frequency resource;

The receiving unit 702 receives data that the at least two access points transmit through the same time-frequency resource according to the joint transmission indication frame according to the same coding manner.

Optionally, as another embodiment, the joint sending indication frame sent by the sending unit 701 may be a control frame.

Optionally, as another embodiment, the joint sending indication frame sent by the sending unit 701 may include a channel number field, a bandwidth field, a modulation and coding policy MCS field, and a data length field, where the channel number field indicates at least two accesses. The channel occupied by the data to be transmitted by the point, the bandwidth field indicates the bandwidth of the time-frequency resource used by the at least two access points to transmit the data, the MCS field indicates the coding mode of the data transmitted by the at least two access points, and the data length field indicates at least two connections. The length of the data sent by the ingress.

Optionally, as another embodiment, the receiving unit 702 may be specifically configured to receive data that is sent by the same frequency band by using the same coding mode after the short frame interval SIFS is delayed by the at least two access points respectively after receiving the joint transmission indication frame. .

Optionally, as another embodiment, the receiving unit 702 is further configured to receive at least two accesses. a request sending frame sent by the first access point in the point, the request sending frame is used to request to send data to the station; wherein, the sending unit is specifically configured to send the frame according to the received request, and send the joint sending to the at least two access points. Indicates the frame.

Optionally, as another embodiment, the wireless local area network system further includes an access controller, where the site 700 further includes:

The obtaining unit 703 acquires identification information of at least two access points;

The sending unit 701 is further configured to send the identifier information of the at least two access points to the access controller, so that the access controller creates the site list according to the information of the acquired site and the identifier information of the at least two access points. Send data to at least two access points that are discovered based on the list of sites.

Figure 8 is a schematic block diagram of an access point in accordance with one embodiment of the present invention. The access point can implement the method or process shown in FIG. 4 or FIG. 6 above. To avoid repetition, it will not be described in detail here. The wireless local area network system where the access point is located includes at least two access points and stations, wherein the stations belong to a basic service set of at least two access points, and the access point 800 includes:

The receiving unit 801 is configured to receive a joint sending indication frame sent by the station, where the joint sending indication frame is used to indicate that at least two access points send the same data by using the same time-frequency resource;

The sending unit 802 is configured to send data to the station according to the joint sending indication frame, where at least two access points send the same data to the station by using the same time-frequency resource in the same coding manner.

Optionally, as another embodiment, the joint sending indication frame received by the receiving unit 801 may be a control frame.

Optionally, as another embodiment, the joint sending indication frame received by the receiving unit 801 may include a channel number field, a bandwidth field, a modulation and coding policy MCS field, and a data length field, where the channel number field indicates at least two accesses. The channel occupied by the data to be transmitted by the point, the bandwidth field indicates the bandwidth of the time-frequency resource used by the at least two access points to transmit the data, the MCS field indicates the coding mode of the data transmitted by the at least two access points, and the data length field indicates at least two connections. The length of the data sent by the ingress.

Optionally, as another embodiment, the sending unit 802 may be specifically configured to send the finger according to the joint. The frame is sent to the station after delaying the short frame interval SIFS when receiving the joint transmission indication frame.

Optionally, as another embodiment, the sending unit 802 is further configured to send a request sending frame to the station, where the sending frame is requested to send data to the station.

Optionally, as another embodiment, the wireless local area network system further includes an access controller, where the access point 800 further includes:

The obtaining unit 803 is configured to acquire information about the site and identification information of the at least two access points.

The sending unit 802 is further configured to send the information of the site and the identifier information of the two access points to the access controller, so that the access controller creates the information according to the acquired site and the identifier information of the at least two access points. a list of sites and sending data to at least two access points that are looked up according to the list of sites;

The receiving unit 802 can also receive data from the access controller.

9 is a schematic block diagram of an access controller in accordance with an embodiment of the present invention. The access controller shown in FIG. 9 can implement the method or process of FIG. 5 to FIG. 6 described above. To avoid repetition, it will not be described in detail herein. The wireless local area network system in which the access controller is located further includes a plurality of access points and at least one station, and the access controller 900 includes:

The first determining unit 901 determines a correspondence between the multiple access points and the at least one site, where each of the at least one site corresponds to at least two of the multiple access points;

The second determining unit 902 determines at least two access points corresponding to the destination station of the downlink data according to the destination station of the downlink data and the correspondence between the multiple access points and the at least one site;

The sending unit 903 sends the downlink data to the at least two access points corresponding to the destination station, so that the at least two access points corresponding to the destination station send the downlink data to the destination station by using the same coding mode.

Optionally, as another embodiment, the first determining unit 901 is specifically configured to receive information of the at least one site and the identifier information of the multiple access points from the at least one station; according to the information of the at least one site and the multiple access points The identification information determines the correspondence between the plurality of access points and the at least one site.

Figure 10 is a schematic block diagram of a station in accordance with another embodiment of the present invention. The embodiment of the present invention can be used in the scenario shown in FIG. 1. The wireless local area network system includes at least two access points and stations, wherein the station belongs to a basic service set of at least two access points, and the station 1000 of FIG. 10 can It is used to implement various steps and methods in the above method embodiments. Site 1000 of Figure 10 includes a processor 1001, a memory 1002. A receiving circuit 1003 and a transmitting circuit 1004. The processor 1001, the memory 1002, and the receiving circuit 1003 are connected by a bus system 1009.

In addition, the station 1000 may also include an antenna 1005 and the like. The processor 1001 controls the operation of the site 1000. The memory 1002 can include read only memory and random access memory and provides instructions and data to the processor 1001. A portion of the memory 1002 may also include non-volatile line random access memory (NVRAM). In a particular application, transmit circuitry 1004 and receive circuitry 1003 can be coupled to antenna 1005. The various components of the site 1000 are coupled together by a bus system 1009, which in addition to the data bus includes a power bus, a control bus, and a status signal bus. However, for clarity of description, various buses are labeled as bus system 1009 in the figure.

The processor 1001 may be an integrated circuit chip with signal processing capabilities. The processor 1001 described above may be a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, or discrete hardware. Component. The methods, steps, and logical block diagrams disclosed in the embodiments of the present invention may be implemented or carried out. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like. The processor 1001 reads the information in the memory 1002 in conjunction with its hardware to control the various components of the site 1000.

The method of FIG. 2 or FIG. 3 can be implemented in the site 1000 of FIG. 10, and is not described in detail to avoid repetition.

Specifically, under the control of the processor 1001, the station 1000 performs the following operations:

Sending a joint sending indication frame to the at least two access points, where the joint sending indication frame is used to indicate that at least two access points send the same data by using the same time-frequency resource;

Receiving data that the at least two access points transmit through the same time-frequency resource according to the joint transmission indication frame according to the same coding manner.

Optionally, as another embodiment, the joint transmission indication frame sent by the transmitting circuit 1004 may be a control frame.

Optionally, as another embodiment, the joint sending indication frame sent by the transmitting circuit 1004 includes a channel number field, a bandwidth field, a modulation and coding policy MCS field, and a data length field, wherein the channel number field indicates a channel occupied by at least two access points to transmit data, and the bandwidth field indicates that at least two access points transmit data. The bandwidth of the time-frequency resource, the MCS field indicates the coding mode of the data transmitted by at least two access points, and the data length field indicates the data length sent by at least two access points.

Optionally, as another embodiment, the receiving circuit 1003 may receive data that is sent by the same frequency band by using the same coding mode after the at least two access points delay the short frame interval SIFS when receiving the joint transmission indication frame.

Optionally, as another embodiment, before the receiving circuit 1003 sends the joint sending indication frame to the at least two access points, the receiving circuit 1003 may further receive the request sent by the first access point of the at least two access points. The frame is sent, and the request sending frame is used to request sending data to the station. The receiving circuit 1003 may specifically send a frame according to the received request, and send a joint sending indication frame to the at least two access points.

Optionally, as another embodiment, the wireless local area network system further includes an access controller, wherein the processor 1001 before the receiving circuit 1003 receives the request sending frame sent by the first access point of the at least two access points, the processor 1001 The identification information of the at least two access points may also be acquired; the sending circuit 1004 may send the identification information of the at least two access points to the access controller, so that the access controller can obtain at least two information according to the acquired information. The identification information of the ingress creates a list of sites and sends data to at least two access points that are looked up according to the list of sites.

11 is a schematic block diagram of an access point according to another embodiment of the present invention. The embodiment of the present invention can be used in the scenario shown in FIG. 1. The wireless local area network system includes at least two access points and stations, wherein the station belongs to a basic service set of at least two access points, and the access point of FIG. 1100 can be used to implement the steps and methods in the foregoing method embodiments. The access point 1100 of FIG. 11 includes a processor 1101, a memory 1102, a receiving circuit 1103, and a transmitting circuit 1104. The processor 1101, the memory 1102, and the receiving circuit 1103 are connected by a bus system 1109.

In addition, the access point 1100 may also include an antenna 1105 or the like. The processor 1101 controls the operation of the access point 1100. Memory 1102 can include read only memory and random access memory and provides instructions and data to processor 1101. A portion of the memory 1102 can also include non-volatile line random access memory (NVRAM). In a particular application, transmit circuitry 1104 and receive circuitry 1103 can be coupled to antenna 1105. The various components of the access point 1100 are coupled together by a bus system 1109, which includes a power bus, a control bus, and a bus in addition to the data bus. State signal bus. However, for clarity of description, various buses are labeled as the bus system 1109 in the figure.

The processor 1101 may be an integrated circuit chip with signal processing capabilities. The processor 1101 described above may be a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, or discrete hardware. Component. The methods, steps, and logical block diagrams disclosed in the embodiments of the present invention may be implemented or carried out. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like. The processor 1101 reads the information in the memory 1102 and controls the various components of the access point 1100 in conjunction with its hardware.

The method of FIG. 4 can be implemented in the access point 1100 of FIG. 11, and is not described in detail to avoid repetition.

Specifically, under the control of the processor 1101, the access point 1100 performs the following operations:

The first access point of the at least two access points receives the joint sending indication frame sent by the station, and the joint sending indication frame is used to indicate that the at least two access points send the same data by using the same time-frequency resource;

Sending data to the station according to the joint sending indication frame, wherein at least two access points send the same data to the station through the same time-frequency resource in the same coding manner.

Optionally, as another embodiment, the joint sending indication frame received by the receiving circuit 1103 is a control frame.

Optionally, as another embodiment, the joint transmission indication frame received by the receiving circuit 1103 includes a channel number field, a bandwidth field, a modulation and coding policy MCS field, and a data length field, where the channel number field indicates at least two access points. The channel occupied by the data transmission, the bandwidth field indicates the bandwidth of the time-frequency resource used by the at least two access points to transmit data, the MCS field indicates the coding mode of the data transmitted by the at least two access points, and the data length field indicates at least two accesses. The length of the data sent by the point.

Optionally, as another embodiment, the transmitting circuit 1104 may send data to the station after delaying the short frame interval SIFS when receiving the joint sending indication frame according to the joint sending indication frame.

Optionally, as another embodiment, before the receiving circuit 1103 receives the joint sending indication frame sent by the station, the transmitting circuit 1104 may further send a request sending frame to the station, and request the sending frame to request the sending data to the station.

Optionally, as another embodiment, the wireless local area network system further includes an access controller, wherein the processor 1101 may further acquire information of the station and the at least two access points before the transmitting circuit 1104 sends the request to send the frame to the station. The identification information may also send the information of the station and the identification information of the two access points to the access controller, so that the access controller creates the information according to the acquired site and the identification information of the at least two access points. The list of stations transmits data to at least two access points that are looked up according to the list of stations; the receiving circuit 1103 can also receive data from the access controller.

Figure 12 is a schematic block diagram of an access controller in accordance with another embodiment of the present invention. The embodiment of the present invention can be used in the scenario shown in FIG. 1. The WLAN system includes an access controller, multiple access points, and at least one site. The access controller 1200 of FIG. 12 can be used to implement the foregoing method embodiment. Each step and method. The access controller 1200 of FIG. 12 includes a processor 1201, a memory 1202, a receiving circuit 1203, and a transmitting circuit 1204. The processor 1201, the memory 1202, and the receiving circuit 1203 are connected by a bus system 1209.

In addition, the access controller 1200 may further include an antenna 1205 or the like. The processor 1201 controls the operation of the access controller 1200. Memory 1202 can include read only memory and random access memory and provides instructions and data to processor 1201. A portion of memory 1202 may also include non-volatile line random access memory (NVRAM). In a particular application, transmit circuitry 1204 and receive circuitry 1303 can be coupled to antenna 1305. The various components of access controller 1200 are coupled together by a bus system 1209 that includes, in addition to the data bus, a power bus, a control bus, and a status signal bus. However, for clarity of description, various buses are labeled as bus system 1209 in the figure.

The processor 1201 may be an integrated circuit chip with signal processing capabilities. The processor 1201 described above may be a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, or discrete hardware. Component. The methods, steps, and logical block diagrams disclosed in the embodiments of the present invention may be implemented or carried out. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like. The processor 1201 reads the information in the memory 1202 and controls the various components of the access controller 1200 in conjunction with its hardware.

The method of FIG. 5 can be implemented in the access controller 1200 of FIG. 12, in order to avoid duplication, no longer A detailed description.

Specifically, under the control of the processor 1201, the access controller 1200 performs the following operations:

Determining a correspondence between the plurality of access points and the at least one station, wherein each of the at least one station corresponds to at least two of the plurality of access points;

Determining at least two access points corresponding to the destination station of the downlink data according to the destination station of the downlink data and the correspondence between the multiple access points and the at least one site;

Sending downlink data to at least two access points corresponding to the destination station, so that at least two access points corresponding to the destination station send downlink data to the destination station by using the same coding mode in the same time-frequency resource.

Optionally, as another embodiment, the receiving circuit 1203 may receive information of at least one site and identification information of multiple access points from at least one site; the processor 1201 may according to information of at least one site and multiple access points. The identification information determines the correspondence between the plurality of access points and the at least one site.

It should be understood that, in various embodiments of the present invention, the size of the sequence numbers of the above processes does not mean the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not be taken to the embodiments of the present invention. The implementation process constitutes any limitation.

Additionally, the terms "system" and "network" are used interchangeably herein. The term "and/or" in this context is merely an association describing the associated object, indicating that there may be three relationships, for example, A and / or B, which may indicate that A exists separately, and both A and B exist, respectively. B these three situations. In addition, the character "/" in this article generally indicates that the contextual object is an "or" relationship.

It should be understood that in the embodiment of the present invention, "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should also be understood that determining B from A does not mean that B is only determined based on A, and that B can also be determined based on A and/or other information.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both, for clarity of hardware and software. Interchangeability, the composition and steps of the various examples have been generally described in terms of function in the above description. Whether these functions are implemented in hardware or software Line, depending on the specific application and design constraints of the technical solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

A person skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, or an electrical, mechanical or other form of connection.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented in hardware, firmware implementation, or a combination thereof. When implemented in software, the functions described above may be stored in or transmitted as one or more instructions or code on a computer readable medium. Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another. A storage medium may be any available media that can be accessed by a computer. By way of example and not limitation, computer readable media may comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, disk storage media or other magnetic storage device, or can be used for carrying or storing in the form of an instruction or data structure. The desired program code and any other medium that can be accessed by the computer. Also. Any connection may suitably be a computer readable medium. For example, if the software Coaxial cable, fiber optic cable, coaxial cable, fiber optic cable, coaxial cable, fiber optic cable, twisted pair cable, digital subscriber line (DSL), or wireless technology such as infrared, radio, and microwave transmission from a website, server, or other remote source. Twisted pair, DSL, or wireless technologies such as infrared, wireless, and microwave are included in the fixing of the associated medium. As used in the present invention, a disk and a disc include a compact disc (CD), a laser disc, a compact disc, a digital versatile disc (DVD), a floppy disk, and a Blu-ray disc, wherein the disc is usually magnetically copied, and the disc is The laser is used to optically replicate the data. Combinations of the above should also be included within the scope of the computer readable media.

In summary, the above description is only a preferred embodiment of the technical solution of the present invention, and is not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

A data transmission method, characterized in that the wireless local area network system to which the method is applied includes at least two access points and stations, wherein the stations belong to a basic service set of the at least two access points, The methods include:

Sending, to the at least two access points, a joint sending indication frame, where the joint sending indication frame is used to indicate that the at least two access points send the same data by using the same time-frequency resource;

And receiving, by the at least two access points, the data that are sent by the same time-frequency resource according to the joint transmission indication frame according to the same coding manner.
The method according to claim 1, wherein the joint transmission indication frame is a control frame.
The method according to claim 1 or 2, wherein the joint transmission indication frame comprises a channel number field, a bandwidth field, a modulation and coding policy MCS field and a data length field, wherein the channel number field indicates the Transmitting, by the at least two access points, a channel occupied by the data, where the bandwidth field indicates a bandwidth of the time-frequency resource used by the at least two access points to send data, where the MCS field indicates that the at least two access points send The encoding mode of the data, the data length field indicating the length of data sent by the at least two access points.
The method according to any one of claims 1-3, wherein the receiving the at least two access points are respectively sent by the same time-frequency resource according to the joint transmission indication frame in the same coding manner. The data includes:

And receiving, by the at least two access points, the data sent by the same frequency band by using the same coding mode after delaying the short frame interval SIFS when receiving the joint transmission indication frame.
The method according to any one of claims 1-4, further comprising: before the sending the joint sending indication frame to the at least two access points, further comprising:

Receiving a request sending frame sent by a first one of the at least two access points, where the request sending frame is used to request to send the data to the station;

Sending the joint sending indication frame to the at least two access points, including:

Sending the frame according to the received request, and sending the joint transmission indication frame to the at least two access points.
The method according to claim 5, wherein said wireless local area network system further comprises an access controller, wherein said request for transmission sent by said first one of said at least two access points is transmitted Before the frame, it also includes:

Obtaining identification information of the at least two access points;

And sending, by the access controller, identification information of the at least two access points, so that the access controller creates a site according to the acquired information of the site and the identifier information of the at least two access points. Listing and transmitting the data to the at least two access points that are looked up according to the list of sites.
A data transmission method, characterized in that the wireless local area network system to which the method is applied includes at least two access points and stations, wherein the stations belong to a basic service set of the at least two access points, The methods include:

The first access point of the at least two access points receives a joint transmission indication frame sent by the station, where the joint transmission indication frame is used to indicate that the at least two access points send the same by using the same time-frequency resource. The data;

And transmitting, according to the joint sending indication frame, the data to the station, where the at least two access points send the same data to the station by using the same time-frequency resource in the same coding manner.
The method according to claim 7, wherein the joint transmission indication frame is a control frame.
The method according to claim 7 or 8, wherein the joint transmission indication frame comprises a channel number field, a bandwidth field, a modulation and coding policy MCS field and a data length field, wherein the channel number field indicates the Transmitting, by the at least two access points, a channel occupied by the data, where the bandwidth field indicates a bandwidth of the time-frequency resource used by the at least two access points to send data, where the MCS field indicates that the at least two access points send The encoding mode of the data, the data length field indicating the length of data sent by the at least two access points.
The method according to any one of claims 7 to 9, wherein the transmitting the data to the station according to the joint sending indication frame comprises:

And transmitting, according to the joint transmission indication frame, the data to the station after delaying the short frame interval SIFS when receiving the joint transmission indication frame.
The method according to any one of claims 7 to 10, wherein before the first access point of the at least two access points receives the joint transmission indication frame sent by the station, the method further includes:

A request to send frame is sent to the station, the request to send frame for requesting the station to send the data.
The method according to claim 11, wherein the WLAN system further comprises an access controller, wherein before the sending the request to send the frame to the station, the method further comprises:

Obtaining information about the site and identification information of the at least two access points;

Sending information of the site and identification information of the two access points to the access controller, so that the access controller is configured according to the acquired information of the site and the at least two access points Identification information creates a list of sites and transmits the data to the at least two access points that are looked up according to the list of sites;

Receiving the data from the access controller.
A method for data transmission, characterized in that the wireless local area network system to which the method is applied includes an access controller, a plurality of access points and at least one station, the method comprising:

Determining a correspondence between the plurality of access points and the at least one site, wherein each of the at least one site corresponds to at least two of the plurality of access points;

Determining at least two access points corresponding to the destination station of the downlink data according to the destination station of the downlink data and the correspondence between the multiple access points and the at least one site;

Sending the downlink data to the at least two access points corresponding to the destination station, so that at least two access points corresponding to the destination station send the same destination frequency resource to the destination station by using the same coding mode. Describe the downlink data.
The method according to claim 13, wherein the determining the correspondence between the plurality of access points and the at least one site comprises:

Receiving information of the at least one site and identification information of the multiple access points from the at least one station;

And determining, according to the information of the at least one site and the identification information of the multiple access points, the correspondence between the multiple access points and the at least one site.
A site, wherein the WLAN system in which the site is located further includes at least two access points, wherein the site belongs to a basic service set of the at least two access points, and the site includes:

a sending unit, configured to send a joint sending indication frame to the at least two access points, where the joint sending indication frame is used to indicate that the at least two access points send the same data by using the same time-frequency resource;

And a receiving unit, configured to receive, by the at least two access points, the data that is sent by using the same time-frequency resource in the same coding manner according to the joint sending indication frame.
The station according to claim 15, wherein the joint transmission indication frame sent by the sending unit is a control frame.
The station according to claim 15 or 16, wherein the joint transmission indication frame sent by the sending unit comprises a channel number field, a bandwidth field, a modulation and coding policy MCS field, and a data length field, where a channel number field indicating a channel occupied by the at least two access points to transmit data, where the bandwidth field indicates a bandwidth of time-frequency resources used by the at least two access points to transmit data, and the MCS field indicates the at least The coding mode of the data transmitted by the two access points, the data length field indicating the data length sent by the at least two access points.
The station according to any one of claims 15-17, characterized in that the receiving unit is specifically used for

And receiving, by the at least two access points, the data sent by the same frequency band by using the same coding mode after delaying the short frame interval SIFS when receiving the joint transmission indication frame.
The station according to any one of claims 15 to 18, wherein the receiving unit is further used for

Receiving a request sending frame sent by a first one of the at least two access points, where the request sending frame is used to request to send the data to the station;

The sending unit is specifically configured to send a frame according to the received request, and send the joint sending indication frame to the at least two access points.
The station according to claim 19, wherein the wireless local area network system further comprises an access controller, wherein the site further comprises:

An obtaining unit, configured to acquire identification information of the at least two access points;

The sending unit is further configured to send the identifier information of the at least two access points to the access controller, so that the access controller is configured according to the acquired information of the site and the at least The identification information of the two access points creates a list of stations and transmits the data to the at least two access points that are looked up according to the list of stations.
An access point, where the wireless local area network system in which the access point is located includes at least two access points and stations, wherein the station belongs to a basic service set of the at least two access points, The access point includes:

a receiving unit, configured to receive a joint sending indication frame sent by the station, where the joint sending indication frame is used to indicate that the at least two access points send the same data by using the same time-frequency resource;

a sending unit, configured to send the data to the station according to the joint sending indication frame, The at least two access points send the same data to the station by using the same time-frequency resource in the same coding manner.
The access point according to claim 21, wherein the joint transmission indication frame received by the receiving unit is a control frame.
The access point according to claim 21 or 22, wherein the joint transmission indication frame received by the receiving unit includes a channel number field, a bandwidth field, a modulation and coding policy MCS field, and a data length field, where The channel number field indicates a channel occupied by the at least two access points to transmit data, and the bandwidth field indicates a bandwidth of time-frequency resources used by the at least two access points to transmit data, where the MCS field indicates Decoding a manner in which at least two access points transmit data, the data length field indicating a length of data sent by the at least two access points.
The access point according to any one of claims 21 to 23, characterized in that the sending unit is specifically used for

And transmitting, according to the joint transmission indication frame, the data to the station after delaying the short frame interval SIFS when receiving the joint transmission indication frame.
The access point according to any one of claims 21 to 24, characterized in that the transmitting unit is further used for

A request to send frame is sent to the station, the request to send frame for requesting the station to send the data.
The access point according to claim 25, wherein the wireless local area network system further comprises an access controller, wherein the access point further comprises:

An acquiring unit, configured to acquire information about the site and identification information of the at least two access points;

The sending unit is further configured to send the information about the site and the identifier information of the two access points to the access controller, so that the access controller is configured according to the acquired site. The information and the identification information of the at least two access points create a site list and send the data to the at least two access points searched according to the site list;

The receiving unit is further configured to receive the data from the access controller.
An access controller, wherein the wireless local area network system in which the access controller is located further includes a plurality of access points and at least one station, and the access controller includes:

a first determining unit, configured to determine a correspondence between the multiple access points and the at least one site, where each of the at least one site corresponds to at least one of the multiple access points Two access points;

a second determining unit, configured to determine, according to the destination station of the downlink data, and the correspondence between the multiple access points and the at least one site, at least two access points corresponding to the destination station of the downlink data;

a sending unit, configured to send the downlink data to at least two access points corresponding to the destination station, so that at least two access points corresponding to the destination station use the same coding mode to use the same time-frequency resource The destination station sends the downlink data.
The access controller according to claim 27, wherein the first determining unit is specifically configured to:

Receiving information of the at least one site and identification information of the multiple access points from the at least one station;

And determining, according to the information of the at least one site and the identification information of the multiple access points, the correspondence between the multiple access points and the at least one site.